1. Hebrew. I've studied Koine Greek and would love to be able to read the Old Testament in its original language as well as the New. (Koine Greek displaces choice #5 if we are including languages we know somewhat but would like to know more fully.)
2. Klingon. Why not?
3. Spanish. My students take it, and it would be nice to be able to know it myself. Plus, I live in Florida.
4. Latin. Etymology is fun, and Latin would help there. Also, some of the historical documents that I find interesting were written in Latin.
5. I'm having trouble deciding here...could be Italian, or German, or Arabic, or Russian, or American Sign Language, or lots of other possibilities. Once I learn the other four I'll narrow it down.